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Characterization of GaN thick layer grown by the HVPE: Comparison of horizontal with vertical growth

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2008, 18(3), pp.101-104
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Van Thi Ha Lai 1 Kwang Bo Shim 1 Bonggeun Choi 1 정진현 2 오동근 1 은종원 1 Lim, Ji Hoon 1 박지은 1 이성국 1 Sung Yi 1

1한양대학교
2유니모테크놀로지

Accredited

ABSTRACT

GaN films were grown on the vertical and horizontal reactors by the hydride vapour phase epitaxy (HVPE). The structural and optical characteristics of the GaN films were investigated depending on the reactor-type. GaN epilayers were characterized by double crystal X-ray diffraction (DC-XRD), transmission electron microscopy (TEM) and photoluminescence (PL). Surface defects of two kinds of the GaN films were revealed by the wet chemical etching method, using H₃PO₄ acid at 200℃ for 8 minutes. Hexagonal etch pits were analyzed by optical microscopy and SEM. Etch pit densities were calculated to be approximately 1.4×10 7 and 1.2×106cm-² for GaN layers grown on horizontal and vertical reactors, respectively. Those results show GaN grown in the vertical reactor having a better quality of optical properties and crystallinity than that in the horizontal reactor.

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